(a) The age at which half the population is older and half is younger.

SA2s WITH HIGHEST AND LOWEST SEX RATIOS(a), 30 June 2015

Sex Ratio

SA2

GCCSA

males per 100 females

HIGHEST SEX RATIOS

East Pilbara

Rest of WA

358.9

Roebourne

Rest of WA

243.5

Ashburton

Rest of WA

238.9

Casuarina - Wellard (East)

Greater Perth

220.5

Meekatharra

Rest of WA

203.5

LOWEST SEX RATIOS

Deakin

Australian Capital Territory

80.7

Page

Australian Capital Territory

81.6

Coombabah

Rest of Qld

82.0

Palmerston - South

Greater Darwin

82.4

Hackett

Australian Capital Territory

82.5

(a) Excludes SA2s with a population of less than 1,000 at June 2015.

SA2s WITH OLDEST AND YOUNGEST MEDIAN AGES(a), 2015

Median Age

SA2

GCCSA

years

OLDEST MEDIAN AGES

Tea Gardens - Hawks Nest

Rest of NSW

61.0

Tuncurry

Rest of NSW

59.7

Bribie Island

Greater Brisbane

59.3

Paynesville

Rest of Vic.

59.0

Victor Harbor

Rest of SA

58.1

YOUNGEST MEDIAN AGES

Acton

Australian Capital Territory

23.3

Yarrabah

Rest of Qld

23.4

Thamarrurr

Rest of NT

23.7

Northern Peninsula

Rest of Qld

24.4

St Lucia

Greater Brisbane

24.4

(a) Excludes SA2s with a population of less than 1,000 at June 2015.

KEY POINTS AT 30 JUNE 2015

Greater Darwin was the only capital city where males outnumbered females.

The SA2s with the highest sex ratios were predominately mining areas in regional Western Australia (including East Pilbara, Roebourne and Ashburton), and areas which contained prisons (including Casuarina - Wellard (East) in Western Australia).

The SA2s with the lowest sex ratios included the Canberra suburbs of Deakin and Page, Coombabah on the Gold Coast and Palmerston - South in Greater Darwin.

Greater Hobart had the oldest population of all Australian capital cities, while Greater Darwin had the youngest.

The SA2s with the oldest median ages were coastal areas, including Tea Gardens - Hawks Nest near Port Stephens in New South Wales, Bribie Island in Queensland, Paynesville in Victoria's Gippsland region, and Victor Harbor on South Australia's Fleurieu Peninsula.

Many of the SA2s with the youngest median ages also had high proportions of Aboriginal and Torres Strait Islander people (including Yarrabah and Northern Peninsula in Queensland, and Thamarrurr in the Northern Territory) or large student populations (Acton in Canberra and St Lucia in Brisbane).